<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    // function fn() {
    //   console.log(123)
    // }

    // function test() {
    //   fn()

    //   console.log(456)

    // }

    // test()


    function fn() {
      console.log(123)
    }

    function test() {
      fn()
      console.log(456)
    }

    test()

    //  123
    //  456
    //  123

  </script>
</body>
</html>